GWD 17 (TN24) 第20题

dragondragon

20. GWD26-Q20

In 1981 children in the United States

spent an averageof slightly less than two and a half hours a week doinghousehold chores; by 1997 they had spent nearly six hours a week.

A.chores; by 1997 they had spent nearly six hoursa week

B.chores; by 1997 that figure had grown to nearlysix hours a week

C.chores, whereas nearly six hours a week werespent in 1997

D.chores, compared with a figure of nearly six hours a week in 1997

E.chores, that figure growing to nearly six hours a week in 1997

请教E选项为什么错误，谢谢！

dawn19

如果用同位语结构要用 a figure 不能用that figure
另外，比语法更重要的是，改变了句子重心。